Pen



FIG. 1 is a front, left perspective view of a pen showing our new design;

FIG. 2 is a front, right perspective view thereof;

FIG. 3 is a front elevational view thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a rear elevational view thereof;

FIG. 6 is a bottom plan view thereof; and,

FIG. 7 is a top plan view thereof. 

I claim the ornamental design for a pen, as shown and described. 